Add USE_ALLOC_MONITOR and USE_LATENCY_MONITOR as options
Add USE_ALLOC_MONITOR and USE_LATENCY_MONITOR as options

This allows to build multiple versions of library from single source
without modifying source each time.

E.g:

    mkdir build_lat_mon
    cd build_lat_mon
    cmake .. -DUSE_LATENCY_MONITOR=ON

You can also see all the options from menu:

    ccmake ..

Signed-off-by: Martin Sustrik <4dd6061be1198639e8b05ce4fd5ead7a0dcaa0f4@250bpm.com>

nirs/nanomsg,potatogim/nanomsg,pakozm/nanomsg,zerotacg/nanomsg,simplestbest/nanomsg,wirebirdlabs/featherweight-nanomsg,thisco-de/nanomsg,kaostao/nanomsg,yan97ao/nanomsg,linearregression/nanomsg,cosin2008/nanomsg.NET,yan97ao/nanomsg,ttyangf/nanomsg,krafczyk/nanomsg,kaostao/nanomsg,featherweight/ftw-kernel-nanomsg,imp/nanomsg,tempbottle/nanomsg,wfxiang08/nanomsg,pch957/nanomsg,hyperfact/nanomsg,reqshark/nanomsg,JackDunaway/featherweight-nanomsg,pakozm/nanomsg,kaostao/nanomsg,TTimo/nanomsg,wirebirdlabs/featherweight-nanomsg,snikulov/nanomsg,cosin2008/nanomsg.NET,smithed/nanomsg,nirs/nanomsg,modulexcite/nanomsg,simplestbest/nanomsg,wfxiang08/nanomsg,gdamore/mamomsg,nirs/nanomsg,krafczyk/nanomsg,TTimo/nanomsg,reqshark/nanomsg,pch957/nanomsg,potatogim/nanomsg,imp/nanomsg,reqshark/nanomsg,TTimo/nanomsg,ttyangf/nanomsg,linearregression/nanomsg,yan97ao/nanomsg,cosin2008/nanomsg.NET,linearregression/nanomsg,ttyangf/nanomsg,wirebirdlabs/featherweight-nanomsg,imp/nanomsg,gdamore/mamomsg,TTimo/nanomsg,featherweight/ftw-kernel-nanomsg,zerotacg/nanomsg,tempbottle/nanomsg,pch957/nanomsg,snikulov/nanomsg,modulexcite/nanomsg,hyperfact/nanomsg,JackDunaway/featherweight-nanomsg,wfxiang08/nanomsg,pakozm/nanomsg,thisco-de/nanomsg,potatogim/nanomsg,smithed/nanomsg,zerotacg/nanomsg,kaostao/nanomsg,modulexcite/nanomsg,JackDunaway/featherweight-nanomsg,krafczyk/nanomsg,hyperfact/nanomsg,tempbottle/nanomsg,simplestbest/nanomsg,smithed/nanomsg,ttyangf/nanomsg,smithed/nanomsg,gdamore/mamomsg